An ongoing federal investigation has zeroed in on FBI informant- turned-serial-killer Scott Kimball as a potential suspect in “several” unsolved disappearances, The Denver Post has learned.

The disclosure was made by the FBI as part of its effort to block the release of a 40-page internal report dissecting its hand ling of the Kimball case.

Various officials have said publicly in recent years that they believed Kimball could have other victims, but the disclosure is the first confirmation that investigators are looking at specific cases.

The status of the ongoing investigations was outlined by Boulder District Attorney Stan Garnett when he denied The Post access to the 40-page memorandum described as an “FBI Human Source Validation Report.” The Post has sought the document, which Garnett’s office obtained during the successful prosecution of Kimball for four killings, under Colorado open-records laws.

The FBI objected to the release, convincing Garnett that making it public could imperil ongoing investigations.

“Obviously, we don’t want to do anything to jeopardize those investigations, because prosecuting Scott Kimball’s been a top priority with us,” Garnett said.

Kimball, 43, is serving a 70-year sentence for four murders committed after he was released from federal prison in December 2002 to act as an FBI informant. He’s also serving 48 years for fraud and 70 months on a federal gun charge.

Kimball, a lifelong con man with four felony convictions, was released from prison on Dec. 18, 2002, to act as an FBI informant after convincing federal agents that his cellmate, Steve Ennis, had asked him to kill a witness in a drug case.

In early 2006, after Kimball was named a suspect in yet another check-fraud case, he fled to California, where he was arrested after a televised car chase and standoff. That same year, the fathers of McLeod and Marcum pressed the FBI for a new investigation, and Kimball’s elaborate web began to unravel. He ultimately agreed to plead guilty to second-degree murder in the four killings.

A hunter found McLeod’s remains in a forest in Jackson County in north-central Colorado in 2007, and Kimball eventually led authorities to Emry’s body in a Utah canyon and to his uncle’s remains in a forest near Vail Pass.

He has never revealed the location of Marcum’s body.

The news that investigators consider him a potential suspect in other disappearances came after The Post fought for two months for the release of documents. The FBI initially sought to block the release by demanding that Garnett’s office return the documents. After Garnett refused, the FBI shared with his office details of the investigations, convincing him to withhold the report.

Under Colorado law, Garnett was required to detail a specific reason for withholding the report. The reason was outlined in a letter from Assistant District Attorney Christopher Zenisek: “the FBI informed us of ongoing investigations related to several missing persons, and it informed us specifically how disclosure of this document could harm those investigations.”

It is not clear whether any of the ongoing investigations center on a Colorado case. Dave Joly, spokesman for the FBI in Denver, said he was unable to comment on an ongoing investigation.

Garnett noted that “Kimball has been active and has traveled a lot as he’s been involved in these cases.”

Among the documents that were released by Garnett’s office is a page of handwritten notes detailing Kimball’s travels in early 2003. According to that paper, he traveled to Wyoming, California, Washington, Montana and Alaska — and various parts of Colorado — between January and June 2003.

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